Grease extracting attachment for ventilators for kitchen ranges



Nov. 29, 1960 E. GRASWICH ET AL 2,961,941

GREASE EXTRACTING ATTACHMENT FOR VENTILATORS FOR KITCHEN RANGES 6Sheets-Sheet 1 Filed Jan. 5, 1958 INVENTORS SVWCH CEDARQMST ,A TTOQNEVSgWARD 634 F /G. 2A

1950 E. GRASWICH ET AL 2,951,941

GREASE EXTRACTING ATTACHMENT FOR VENTILATORS FOR KITCHEN RANGES FiledJan. 6, 1958 6 Sheets-Sheet 2 ATTORNEYS Nov. 29, 1960 E. GRASWICH ETAL2,961,941

GREASE EXTRACTING ATTACHMENT FOR VENTILATORS FOR KITCHEN RANGES FiledJan. 6, 1958 6 Sheets-Sheet 3 INVENTORS EDWARD GRASW/CH Y JACK M4CEDARQU/ST ATTORNEYS NOV. 29, 1960 e sw c E 2,961,941

GREASE EXTRACTI NG ATTACHMENT FOR VENTILATORS FOR KITCHEN RANGES FiledJan. 6, 1958 6 Sheets-Sheet 5 O In l 5 D n 9 u m m somRo l W/c/v f g 0',*9 g, JACKWCEDAROUIST to ca Y 6 B 5 S (D P M ATTORNEYS Nov. 29, 1960 E.GRASWICH ETAL 2,961,941

GREASE EXTRACTING ATTACHMENT FOR VENTILATORS FOR KITCHEN RANGES 6Sheets-Sheet 6 Filed Jan. 6, 1958 INVENTRS GRAS W/CH CEDARQU/ST ATTOPNEVS United States Patent O GREASE EXTRACTIN G ATTACHNIENT FORVENTILATORS FOR KITCHEN RANGES Edward Graswich and Jack W. Cedarquist,San Francisco, Cal1f., assignors to Dohrmaun Hotel Supply Co., SanFrancisco, Calif.

Filed Jan. 6, 1958, Ser. No. 707,175

8 Claims. (Cl. 98-115) This invention relates to ventilator apparatusfor exhausting cooking gases from cooking surfaces in general. Moreparticularly this invention relates to ventilator apparatus in whichmanually or automatically controlled means is provided for substantiallyeliminating or preventing the occurrence of fires in the ventilatorpassage caused by burning of the cooking gases that are being exhausted.

An object of this invention is to provide an improved ventilatorstructure for use with cooking ranges, said ventilator having means toreduce hazards from fires igniting the gases being exhausted thereby.

Still another object of this invention is to provide an improvedventilator structure for use with cooking ranges, said structure havinga fire door positioned in the lower part thereof so that it is visibleto the cook operating the cooking range, whereby whether the door isopen or closed may be readily determined.

A further object of this invention is to provide an improved fire doorarrangement to the bottom portion of the ventilator passage for cookingranges, said door being constructed to close off the entire passage sothat no grease covered surfaces thereof are left exposed to fire whensaid door is closed.

Still a further object of this invention is to provide an improvedelectrically controlled arrangement for closing and opening ventilatordoors provided to ventilator ducts for exhausting cooking gases.

Other and further objects of this invention will be apparent to thoseskilled in the art to which this invention relates from the followingspecification, claims and drawing.

In accordance with this invention there is provided an improvedarrangement for controlling the operation of doors, such as, fire doorsassociated with the lower end of the ventilator passage employed forexhausting cooking gases from cooking surfaces of ranges. With thisarrangement the entire passage is closed when the door is closed so thatno grease covered surfaces of the passage are exposed. These doors areprovided with spring loaded operating leverages that may be controlledor tripped either manually or electrically so that they function toclose the fire door, the same operating leverage being employed formanually opening the door.

Where the door operating leverage is adapted to be tripped or unlatchedby electrical means the leverage may also be provided with an electricalswitch actuating member that controls the electrical circuit to theventilator blower whereby this circuit is interrupted when the fire dooris closed. Where only manual control of the door is provided and ablower is employed in the ventilator, the same switch actuating memberfor automatically controlling the circuit of the blower motor, when thedoor operating leverage is tripped, may be employed, or a manuallycontrolled switch may be provided for this purpose.

Further details of this invention will be set forth in ice the followingspecification, claims and drawing in which briefly: V

Fig. l is a front view of the bottom portion of the ventilator structureshowing its relation with respect to the top of the cooking surface ofthe range;

Fig. 2 is a sectional view taken along the line 3-3 of Fig. 1 showingthe fire door open;

Fig. 2a is a sectional view taken along the line 2a-2a of Fig. 2;

Fig. 3 is a sectional view similar to Fig. 2 showing the fire doorclosed;

Fig. 4 is a vertical sectional view showing the door operating'structureshown in Fig. 3 and a rotatable gas degreasing device positioned in thegas ventilator above this structure; 7

Fig. 5 is a sectional view taken along the line 55 of Fig. 6 showingonly the door operating leverage and also showing electrically actuatedas Well as manually actuated tripping or unlatching means for saidleverage, together with means for controlling the ventilator blowermotor switch;

Fig. 6 is a plan view of the mechanism shown in Fig. 5;

Fig. 7 is a schematic wiring diagram of connections employed with thisinvention; v

Fig. 8 is a vertical sectional view of a modified form of thisinvention;

Fig. 9 is a vertical sectional view of another modified form of thisinvention; and

Fig. 10 is a view of the rotatable vane device that is positioned oneither side of the door operating mechanism shown in Fig. 9.

Referring to Figs. 1-4 of the drawings in detail, there is illustratedan embodiment of this invention employing a sheet metal structure 10defining a passage or gas vent. This structure is provided with a sheetmetal extension 11 extending to the front thereof and having positionedtherein a rod member 12 that is provided with a handle 13 attached tothe front end thereof as shown in Figs. 2 and 3. The bottom of thissheet metal structure is provided with a bottom portion 18 that isformed with an opening 14 which is adapted to be closed by the door 15,and through which gases from the cooking surfaces 18a shown in Fig. lare exhausted. This opening has a top lip portion 16 and a bottom lipportion 17 which are adapted to be engaged by the aforesaid door toclose said opening.

The inner end of the rod member 12 is provided with a trip member 19that has a depending portion 22 which is adapted to engage the pointedfront of a pivoted member 23 that is pivotally supported by the pin 24on the members 20. These members 20 are in the form of elongated stripsthat are attached to the sides of the bearing members 21 as shown inFigs. 2a and 6 and which are provided with suitable holes for slidablyreceiving the rod 12.

The innermost ends of these members 20 are pivotally attached to thetoggle member 25 by means of a pin 26. The toggle member 25 is pivotallysupported on the plate 39 by means of the stud 27 and this plate isattached to inner surface of the wall structure 10. Adjacent to the pin26 the toggle member 25 is provided with an angular shape or corner 28which is adapted to be engaged by the members 29 and 31 which are heldagainst said corner by the spring 41, one end of which is attached tothe member 31 and the other end of which is attached to the stud 40 thatis supported by the plate 39, as shown in Fig.

6. The member 29 is provided with a foot portion30 that is adapted to beengaged by the upper end of the trip member 23 as will be described morefully hereinafter in the description of the operation of'this invention.

The members 29 and 31 function as a latch for the toggle member 25 andfor this purpose the sleeve 32fto which this member 29 is attached isrotatably supported on the tubular member 33 which is also supported bythe plate 39. The bracket members 34 are also rotatably supported on thetubular member 33 and the sleeve 32 is positioned between these bracketmembers which are provided for the purpose of swingably supporting thearm 35 to which the door 15 is attached. The upper part of the arm 35 isattached to the lower portions of these bracket members by welding orthe like and the hinge part 42 that is attached to the frame of the door15 by means of the pin 43 is adjustably attached to the lower portion ofthis arm.

The toggle member 25 is provided with a threaded member 36 which isfixedly attached to the lower end of this toggle member and which isprovided with a foot 37 that is adjustably supported on this threadedmember The foot 37 is adapted to engagethe door supporting arm 35 tohold the door in open position againstthe tension of the spring 44, oneend of which is attached to the pin 45 that is attached to one of thebracket members 34 as shown in Figure 6 and the other end of which isattached to the front of the well structure 11 by means of the hook 46as shown in Figure 2.

The form of this invention shown in Fig. 2 provides only for manuallytripping the door closing mechanism and this is accomplished by pressinginward on the handle 13 that is mounted on the outer end of the rod 12.Thus, when it is desired to have the door 15 close the opening 14, thehandle 13 is pressed inward toward the projecting well structure 11 ashort distance so that the trip member 22 engages the front of thepivotally supported lever 23 causing this lever to be swung on its pivot24 a sufficient distance so that the upper end thereof lifts the footportion 30 of the member 29 whereby the members 25 and 31 are movedclear of the corner portion 28 f the toggle 25 thereby releasing thistoggle member so that it may swing in a counter clockwise direction onits pivot 27. As a result, the member 25 releases the door supportingmember 35 which is then swung forward by the spring 44 and the door 15is carried forward to close the opening 14 as shown in Fig. 3.

The door operating mechanisms illustrated in Figs. 2 and 3 may beinstalled in ventilator structure such as shown in Fig. 4 wherein arotatable set of vanes is positioned in the ventilator passage definedby the wall structure b. The rotatable vane device may take the formshown in Patent No. 2,793,712, issued on May 23, 1957. This rotatablevane structure comprises a horizontal substantially circular bathemember 102 that is mounted on a suitable shaft and bearing arrangementsupported on a channel iron frame member 10d in a manner similar to thatshown in the above patent. A set of radially extending vanes 10] isprovided at the bottom of therotatable bafile Ne and a similar set ofradially extending vanes 10gis provided at the top of this baffle. Thesevanes are attached to the top and bottom of the baffle at spaced pointsso that a plurality thereof is employed around the outer half of the topand bottom of the bathe. The cooking gases are guided to the opening1011 provided in the horizontal wall 10c and in general these gasesfollow the paths designated by the lines 10k.

The passage leading to the rotatable vane structure is defined by thefront and back wall members 10 which define a passage extendingsubstantially vertically above the opening 14 in the lower part of theventilator structure. The inclined wall member 10a extends between thefront passage wall 10 and the upper wall 1% and it is of course obviousthat this inclined wall 16a may be shortened so that the front wall 10may be moved forward to the front part of the horizontal wall 11 wherebythe gas passage may be provided between the top of the extension 11substantially vertically to the opening 1012 of the rotatable vanehousing if this is desired.

As mentioned above, the cooking gases are guided along .paths designatedby .the lines 10k.and it will be observed that these paths are of atortuous configuration so that the gases more or less abruptly changedirection in their passage through the vane structure and this isdesirable since it enhances the extraction of greases carried by thesegases. The greases extracted from the gas drop down upon the baffleportions 10c and flow from these downward through the passage. Some ofthe grease will of course drop upon the inclined wall 10a and flowdownward along this wall to the trough portion 18 in the lower part ofthe ventilator structure and such grease as is collected in this troughmay be scooped out therefrom When it is congealed or suitable drainpipes may be provided to this trough portion at spaced intervals for thepurpose of draining the grease out of the trough portion when the greaseis in fluid condition.

The embodiment of this invention shown in Figs. 5 and 6 may be eithermanually tripped as described above in connection with the descriptionof Figs. 2 and 3 or it may be tripped by an electromagnetic mechanismthat may be either manually controlled by an electric switch or it maybe controlled by means of thermostats suitably located on the lower partof the vent structure. The housing 11a that is positioned on top of theextension 11 is provided for the purpose of enclosing the relay 50 whichhas associated therewith a magnetic armature 51, the lower end of whichis attached to the .rod 52 by means of a pin 52a. The lower end ofthisrod 52 is provided with a roller 53 that is adapted to support oneend of the arm 54, the other end of which is pivotally supported on theplate 39, and this arm 54 is adapted to engage the arm 31 that isattached to the member 29. The housing 11a also encloses a switch 56that is supported therein on the bracket 57 and this switch is providedwith an actuating member 55 that projects into the extension 11 andrides on the member 29a that is provided with an inclined portion and ahorizontal portion. This member 20a is supported by one of the members20 for the purpose of actuating the switch 56 as will be describedhereinafter. The relay 50 and switch 56 are connected as shown in thewiring diagram iliustrated in Fig. 6.

This wiring diagram shows a pair of relays 50 and 50a and a pair ofswitches 56 and 56a which are connected to individual terminal boards 65and 65a and this arrangement may be employed for controlling a pair ofdoor operating mechanisms that may be provided to a single ventilatorstructure and blower arrangement.

The wiring diagram illustrates a pair of terminal blocks 65 and 65a,each having five terminal positions A, B, C, D and E, and each of theseterminal positions includes an upper terminal and a lower terminal. Eachof these terminal blocks may be positioned in a housing such as therelay housing 11a and it may be associated therein with the particularrelay 5t} and switch 56 that are connected to selected lower terminalsthereof. The lower terminals A and C of the block 65 are connected to asuitable source of current supply such as the conventional v. supply.One side of the relay 50 is also connected to the lower terminal C andthe other side of this relay is connected to the lower terminal B. Thelower terminals D and E are connected to the blower cut-out switch 56.in the case of the terminal block 65a, the lower terminals B and C areconnected to the relay 50a and the lower terminals D and E are connectedto the switch 56a. The upper terminals A and B of each of the blocks 65and 65a are connected together by the conductors 66 and 67 and thethermostats 63 are bridged across these conductors as shown. The manualswitch 64 is also bridged across these conductors. Accordingly, wheneither of the thermostatic switches 63 or the manual switch 54 areclosed the circuits between the US v. current supply and the windings ofthe relays 50 and 50a are closed. The upper terminal C of the blocks 65and 65a are connected to .gether by .the conductorfifi, the .upperterminals D of the blocks 65 and 65:: are connected together'by theconductor 69 and the upper terminals E of these blocks are connected tothe respective upper terminals of the blower control switch 62 by meansof the conductors 70 and 71, respectively. The lower terminals of thisswitch 62 are connected to the magnetic switch 61 which is connected tothe 110 v., 220 v. source of sup ly, and to the blower motor 60. Theblower motor 60 and the blower associated therewith are positioned toprovide a forced draft through the passage of the ventilator structureand for this purpose they may be located at any desirable point alongthe stack forming this passage.

The blower cut-out switches 56 and 56a are positioned in the relayhousing 11a as shown in Fig. 5 and these switches are adapted to be heldclosed by the operating rods such as rod 55 which is adapted to engagethe mem ber 20a. Accordingly, when this rod engages the inclined portionof the member 20a, that is, when the members 20 are shifted to the leftin the closing of the door 15, the switch 56 is opened and the blower iscut out when the door is closed. When the door 15 is opened, the members29 are in position so that the switch operating rod 55 engages theelevated portion of the member a and the cut-out switch 56 is closed sothat the blower motor may be energized.

The form of this invention illustrated in Fig. 8 employs a ventilatorstructure that is provided with a horizontal opening 14a positioned moreor less directly over the cooking surface and this opening 14a isadapted to be closed by the door 15a. The door 15a cooperates with thewall structure 88 and 81 which define the onening 14a and the wallstructure 81 is provided with a trough 82 at the lower end thereofencircling the front and sides of the opening 14a and this trough may bearranged to catch any grease that may be precipitated around thisopening from the cooking gases. This trough may be provided with anopening through the wall 80 for draining said trough. The wall 80 isjoined to a horizontal wall 83 which is provided with a drain pipe 84and this horizontal wall 83 is joined to the bottom end of the inclinedwall 85 that extends to the rear wall 86. Another horizontal wall 87 ispositioned above the inclined wall 85 and this horizontal wall 87defines the upper extent of the gas passage leading to the rotatablevane structure 88 which is positioned above the opening 87a in the wall87 and is also similar to the rotatable vane structure disclosed inPatent No. 2,793,712 mentioned above. This rotatable vane structure ispositioned above the opening 87a which is smaller than the diameter ofsaid vane structure so that the gases entering said opening are causedto follow a tortuous path as indicated generally by the lines 8712. Thehorizontal wall 87 extends forward over the top of the door mechanismincluding the door 15a and the operating mechanism therefor.

The door 15a is attached by means of a hinge 89 and is provided with aband member 90 having bent end portions 91 and 92, said band beingattached at these bent portions to the front and back of the door 15a.This band member 90 is provided with a portion 90a which is adapted toengage the bottom of the rod 55 which actuates the switch 56. The switch56 and the relay 50 are positioned in a small housing 11a that isattached to the top of the horizontal wall 87 and the switch actuatingrod 55 and the relay rod 52a extend into the ventilator structurethrough suitable openings formed in the bottom of the housing 11a andaligned with corresponding openings formed in the horizontal wall 87.

A member 93 of substantially triangular configuration, is also attachedto the door 15a and this member extends upward from this door so as tobe straddled by the parallel members 94 which are positioned one on eachside of they vertical member 93. A pin 95 is carried by the parallelmembers 94 and this pin 95 is adapted to enwhich it closes the opening14a.

gage one of the sides of the triangular member to lift the door 15a toits open position when the operator pulls on the handle 13a so that rod12a and members 94 are shifted laterally. When the door is open the topof the triangular member 93 engages the latching member 96 which isattached by the screw 97 to one end of the channel member 98, the otherend of which is attached by the spring hinge to the vertical framemember 101 that extends between the horizontal member 87 and the wall81.

The member 100 is attached to the top of the latching member 98 and thismember 100 is provided with a pin for pivotally attaching it to thebottom of the relay rod 52a.

The door 15a is shown in open position in Fig. 8 and it is also shown inbroken lines in closed position. It is held in the open position bymeans of the triangular member 93 when the latter is in engagement withthe latch 96 that is supported on the latching member 98 by the screw97. When it is desired to close the door 15a manually, the handle 13a ispressed inwardly a short distance so that the parallel members 94 engagethe depending portion of the latch 96 and cause this latch '96'to beelevated sufiiciently so that the triangular member 93 is releasedthereby. The depending portion of .the' latch 96 is provided with aninclined surface so that the ends of the parallel members 94 mayslidably engage this inclined surface and move the latch upward. Whenthe member 93 is disengaged by the latch 96, the door 15a is free tomove by gravity to its closed position in When the operator desires toopen the door 15a, he simply moves the handle 13a and the rod 12aattached thereto outward so that the pin slidably engages the side ofthe triangular member 93 and thereby elevates the door 15a away from theopening 14a until the upper portion of the triangular member 93 isengaged by the latch 96 and held thereby.

The door 15a may also be unlatched by energizing the relay 50 which isconnected as shown inthe wiring diagram, Fig. 6. When the relay 50 isenergized it functions to lift the member 98 which is connected to therelay armature by the member and the rod 52a, and the member 93 isunlatched.

In Figs. 9 and 10 there is shown another embodiment of this inventionwhich may be employed as a broiler hood and the like and the back wallstructure. of which may be coincident with or the same as the wall 86 ofthe hood structure shown in Fig. 8, in which case both hood structuresmay open into the same stack such as the stack 111a. This hood isprovided with rear wall strtucture 110, a top wall 111 and a front wall112. The front wall terminates in a trough 113 and slightly above thistrough there is provided an inclined wall 114 which terminates in avertical section 115 that defines one of the lips of the opening 116.This opening is adapted to be closed by the door 117 which is providedwith a vertical triangular member 118. The door 117 is supported by thehinge 120 on the corner of the horizontal wall 122 and vertical wall 121and the horizontal wall 122 extends from the door 117 to the front wall112.

The door operating mechanism which will be described in detailhereinafter, is positioned between the horizontal walls 122 and 123which extend between the front wall 112 and the wall 121. While thewalls 122 and 123 are shown joined to these walls 112 and 121, they maybe provided with wall extensions positioned behind the front wall 112and in front of wall 121 to form the front and back of the rotor housingin cases where the bottom 88a and top 88b of this housing are extensionsof the walls 122 and 123, respectively.

The rotatable vane structure 88, similar to the rotatable vane structure10 shown in Fig. 4, is adapted to be positioned in a housing having abottom wall 88aand a top wall 88b which may be extensionsof the walls122 124. This rod 124 is attached to the rod 124a by the couplingmembers 127 which are provided with projections that engage one end ofthe compression spring 126 which is positioned between these projectionsand the wall 128 through which the rod 124a extends. The wall 128defines a compartment in which are positioned the door latching and tripmechanisms including the relay 50 and the blower cut-out switch 56. Thelatch 130 is supported on the wall 128 by a spring hinge 135 and thislatch carries a member 131 that is adapted to engage the forward end ofthe members 129, which forward end is attached to the rod 124a. Themembers 129 comprise a pair of strip members that are held together bybearing members 21a in which the rod 12b is slidably supported. The rod12b is provided with a trip member 22a which is fixedly attached to saidrod and is adapted to engage the forward portion of the trip lever 23athat is pivotally attached to the members 129 by the pin 24a. The rod12b is also provided with an actuating handle 13b that is positioned onthe outside of the wall 112.

The trip member 130 is provided with an extension to which theupstanding member 132 is attached and this member 132 is pivotallyattached to the armature of the relay 50 which is supported by asuitable bracket attached to the top wall portion 128 of thecompartment. One of the strip members 129 is provided with a switchactuating member 133 which is shaped with a horizontal portion and aninclined portion for the purpose of actuating the switch 56 when themembers 129 are shifted laterally. The switch 56 is supported on thebracket 134 that is attached to the wall 112.

The inclined wall 114 is positioned below the rotatable vane structure88 and as a result grease will collect on this wall. In order tofacilitate removal of this grease, this wall may be made removable. Itmay be provided with an angular extension extending down into the trough113 to hold it in place. On the other hand the wall 114 may be providedwith a door similar to the door 116a in the inclined wall opposite tothe wall 114. The door 110a is provided with edge flanges that arefrictionally held in a groove formed around the door opening.

The door 117 may be opened by pulling the rod 12b outward by grippingthe handle 13b and when this is done the pin 125 carried by the rod 124slidably engages the member 118 in the slot 119. Thus when the door 117is closed this pin is in the upper end of the slot 119 as shown by thebroken lines and when the door is open it is in the lower end of thisslot as shown in Fig. 9. When the door is open the spring 126, that ispositioned on the rod 124a between the projections of the members 127and the wall 128, is compressed. The door is held open and the spring126 is held compressed by the latching member 131 which engages the endof the members 129' and thus prevents the spring 126 from closing thedoor 117 until this latch member is released. Releasing the latch membermay be accomplished manually by pressing the handle 13b and causing therod 12b to press the trip member 22a against the lever 23a therebylifting the trip member 130; or releasing the latch member may beaccomplished by energizing therelay 50 thereby causing this relay tolift its armature and the member 132 which is attached to the tripmember whereby said trip member may be lifted out of engagement with theend of the strip members 129.

Releasing the latch member permits the spring 126 to close the door 117and also permits the rod 124a which is attached to the members 129 tomove these latter mem- "hers laterally with said rod. Since the'switchoperating 8 member 133 is attached to one of the members 129, movementof these latter members also moves the switch actuating member 133 andpermits the switch 56 to be opened to cut 01? the blower motor aspreviously described in connection with the description of the wiringdiagram.

While we have shown and described a preferred manner of carrying out ourinvention, and a preferred apparatus for the same purpose, the inventionis obviously capable of modification and variation from the form shown,so that the scope thereof should be limited only by the scope of theclaims appended hereto.

What we claim is:

1. In ventilator structure adapted for exhausting cooking gases fromcooking surfaces of ranges the combination of wall structure forming apassage for exhausting cooking gases from the cooking surface of arange, said passage having an opening for admitting the cooking gasesinto said passage, a door for said opening, means for supporting saiddoor so that the position of said door both in open and closed positionis visible to the cooking range operator, said door being adapted toclose the bottom of said gas exhausting passage so that no greasecollecting wall parts of said passage are exposed at the bottom thereofwhen said door is closed, said door supporting means comprising an arm,means for pivotally supporting one end of said arm on said wallstructure and means for attaching the other end of said arm to saiddoor, a lever, means for pivotally supporting said lever on said wallstructure, means for moving one end of said lever into engagement withsaid arm for moving said door into open position, latching means forengaging the other end of said lever for holding said door in openposition, means for disengaging said latching means from said lever andmeans for closing said door when said latching means is disengaged fromsaid lever.

2. In ventilator structure adapted for exhausting cooking gases fromcooking surfaces of ranges the combination of wall structure forming apassage for exhausting cooking gases from the cooking surface of arange, said passage having an opening for admitting the cooking gasesinto said passage, a door for said opening, means for supporting saiddoor, so that the position of said door both in open and closed positionis visible to the cooking range operator, said door being adapted toclose the bottom of said gas exhausting passage so that no greasecollecting wall parts of said passage are exposed at the bottom thereofwhen said door is closed, said means comprising an arm, means forpivotally supporting one end of said arm on said wall structure andmeans for attaching the other end of said arm to said door lever, meansfor pivotally supportingt said lever on said wall structure, means formoving one end of said lever into engagement with said arm to hold saiddoor in open position, latching means for engaging the other end of saidlever for maintaining said one end of said lever pressed against saidarm so that said lever holds said door in open position,electromechanical means for disengaging said latching means from saidlever, thermostatically controlled switch means for controlling saidelectromechanical means, said thermostatically controlled switch meansbeing positioned to be responsive to ignited gases above the cookingsurface, and means for closing said door when said latching means isdisengaged from said lever.

3. In ventilator structure adapted for exhausting cooking gases fromcooking surfaces of ranges the combination of wall structure forming apassage for exhausting cooking gases from the cooking surface of arange, said passage having an opening for admitting the cooking gasesinto said passage, a door for said opening, means grease collecting wallparts of said passage are exposed at the bottom thereof when said dooris closed, said door supporting means comprising an arm, means forpivotally supporting one end of said arm on said wall structure, meansfor attaching the other end of said arm to said door, a lever, means forpivotally supporting said lever on said wall structure, means for movingone end of said lever into engagement with said arm to hold said door inopen position, latching means for engaging the other end of said leverfor holding said door in open position, means for disengaging saidlatching means from said lever, means for closing said door when saidlatching means is disengaged from said lever, and manually operablemeans also engaging the other of said levers for opening said door.

4. In ventilator structure adapted to be used to exhaust gases fromcooking ranges the combination of a wall structure forming a ventilatingpassage for exhausting cooking gases, said passage having an openingnear the bottom thereof for admitting said cooking gases, means forsupporting said structure above the cooking surface of the cookingrange, a door for closing the lower end of said passage to cut off aircirculation from said passage in case the cooking gases are accidentallyignited, means including an arm for pivotally supporting said door, saiddoor being adapted to close said opening near the bottom of said gasexhausting passage so that no grease collecting wall parts of saidpassage are exposed at the bottom thereof when said door is closed, alever engaging said arm for holding said door in open position, saiddoor being adapted to be swung away from said opening against a wall ofsaid passage whereby when said passage is opened, said door does notobstruct passage of cooking gases therethrough, latch means for latchingsaid lever when said door is in open position, means for tripping saidlatching means, means for closing said door when said latching means istripped, said tripping means including means adapted to be moved in onedirection to trip said latching means and in the other direction to movesaid lever into engagement with said arm and open said door.

5. In a ventilator structure adapted for exhausting cooking gases fromcooking sufaces of ranges, the combination of wall structure forming apassage for exhausting cooking gases from the cooking surface of arange, said passage having an opening for admitting the cooking gasesinto said passage, a door for said opening, means for supporting saiddoor so that the position of said door both in open and closed positionis visible to the cooking range operator, said door being adapted toclose the bottom of said gas exhausting passage so that no greasecollecting wallparts of said passage are exposed at the bottom thereofwhen said door is closed, said door supporting means comprising an arm,means for pivotally supporting one end of said arm on said wallstructure and means for attaching the other end of said arm to saiddoor, a lever, means for pivotally supporting said lever on said wallstructure, manually operable means connected to one end of said leverand adapted to be pulled by the cooking range operator to bring theother end of said lever into sliding contact with said arm to open saiddoor, said lever also having means for frictionally engaging said arm tohold said door in open position, latching means for engaging the otherend of said lever for holding said door in open position, means fordisengaging said latching means from said lever and means for closingsaid door when said latching means is disengaged from said lever.

6. In a ventilator structure adapted to be used to exhaust gases fromcooking ranges the combination of a wall structure forming a ventilatingpassage for exhausting cooking gases, said passage having an openingnear the bottom thereof for admitting said cooking gases, means forsupporting said structure above the cooking surface of the cookingrange, a door for closing said opening near the bottom of said passageto cut off air circulation from said passage in case the cooking gasesare accidentally ignited, an arm having one end attached to said door,means for pivotally supporting the other end of said arm on said wallstructure, said door being adapted to close said opening near the bottomof said gas exhausting passage so that no grease collecting wall partsof said passage are exposed at the bottom thereof when said door isclosed, a lever engaging said arm to swing said door into its openposition, said arm being adapted to swing said door away from saidopening and along side of a wall of said passage whereby when said dooris open it does not obstruct passage of cooking gases through saidpassage, latch means for latching said lever to hold said door in itsopen position, means for tripping said latching means, means for closingsaid door when said latching means is tripped, and manually operablemeans adapted to be moved in one direction to engage said tripping meansand to trip said latching means and in the other direction to move saidlever into engagement with said arm and open said door.

7. In ventilator structure adapted to be used to exhaust gases fromcooking ranges the combination of a wall structure forming a ventilatingpassage for exhausting cooking gases, said passage having an openingnear the bottom thereof for admitting said cooking gases, means forsupporting said structure above the cooking surface of the cookingrange, a door for closing said opening near the bottom of said passageto cut off air circulation from said passage in case the cooking gasesare accidentally ignited, an arm having one end attached to said door,means for pivotally supporting the other end of said arm on said wallstructure, said door being adapted to close said opening near the bottomof said gas exhausting passage so that no grease collecting wall partsof said passage are exposed at the bottom thereof when said door isclosed, a lever engaging said arm to swing said door into its openposition, said arm being adapted to swing said door away from saidopening and alongside of a wall of said passage whereby when said dooris open it does not obstruct passage of cooking gases through saidpassage, releaseable means engaging said lever to hold said door in itsopen position, means for closing said door when said releaseable meansis released, and manually operable means for releasing said releaseablemeans when moved in one direction so that said closing means closes saiddoor and for engaging said lever to open said door when moved in theopposite direction.

8. In ventilator structure adapted to be used to exhaust gases fromcooking ranges the combination of a wall structure forming a ventilatingpassage for exhausting cooking gases, said passage having an openingnear the bottom thereof for admitting said cooking gases, means forsupporting said structure above the cooking surface of the cookingrange, a door for closing said opening near the bottom of said passageto cut off air circulation from said passage in case the cooking gasesare accidentally ignited, an arm having One end attached to said door,means for pivotally supporting the other end of said arm on said wallstructure, said door being adapted to close said opening near the bottomof said gas exhausting passage so that no grease collecting wall partsof said passage are exposed at the bottom thereof when said door isclosed, -a lever having one end engaging said arm to swing said doorinto its open position, means for pivotally supporting said lever onsaid wall structure, said arm being adapted to swing said door away fromsaid opening and alongside of a wall of said passage whereby when saiddoor is open it does not obstruct passage of cooking gases through saidpassage, latch means for latching said lever to hold said door in itsopen position, means for tripping said latching means comprising ashiftable member have means and in the other direction to move saidlever into engagement with said arm and open said door.

References Cited in the file of thispatent UNITED STATES PATENTS HummelMay 22, 1906 Ewald Feb. 21, 1933 Sonntag Apr. 20, 1937 Ames Dec. 5, 1939Lamb Apr. 14, 1942 Sonntag Nov. 3, 1953 Gaylord Nov. 19, 1957

